Hi All, My situation is as below: CE Router------Edge Router---------Core Router-------Internet The link between CE Router and Edge Router is using ULA, the link between Edge Router and Core Router is also using ULA, the link between Core Router and Internet is using GUA. Internet Router will give us the default route to Core Router, Core Router will redistribute the default router to OSPF which is the IGP for our network, so the CE Router can get the default route. For the return traffic, the CE router will advertise the prefixes which will allocate the the hosts to OSPF, then Core Router also learning this prefixes. Core Router will advertise this prefixes to Internet Router through BGP. These prefixes are in the GUA range.
My concerns is that, if we don't configure any GUA in the Edge Router and Core Router, can we receive the default route from Internet Router, also for the return traffic, can go outside or not? Will appreciate for any comments. Best Regards, Hu Xu 2012/9/11 Peter Rathlev <pe...@rathlev.dk> > On Mon, 2012-09-10 at 22:45 +0100, Aled Morris wrote: > > On 10 September 2012 21:56, Mack McBride <mack.mcbr...@viawest.com> > wrote: > > > If you are using ULA please be sure to use the correct procedure to > > > generate a /48 and register the /48 subnet with SixXS. This keeps > > > ULA unique. > > > > Am I the only one to find this a bit of a contradiction in terms? If > > you're going to register it, how is it not then a kind of GUA? Really? > > Just make sure the prefix is generated in a sufficiently random fashion > (RFC4193 3.2.1) and rest assured that the law of large numbers is on > your side. > > SixXS does host a generator that complies with RFC4193 3.2.1. Even > though GUA is easy to get it's not as easy as pushing a few buttons on a > webpage. > > (What's with the cross posting?) > > -- > Peter > > > _______________________________________________ > cisco-nsp mailing list cisco-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/